Possible Clues:

• Lingual bone that's not attached to any other bone
• The ____ bone supports the tongue, and is the only human bone not connected directly to another bone
• Bone at the base of the tongue
• ___ bone (U-shaped bone above the larynx)
• I'm here in US, breaking concealed bone
• Bone by the tongue
• Tongue bone
• Bone that supports the tongue